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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58a0a4195e7d4a02e7f2e627ed697b4d4f5894303d492317354674b3e2c7bdd8' 
  AND token = 'DGoxzbLpyMWyfINkkbIxKas1dNd2Puay5R9bKOKP5Ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00671

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}