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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1119f85e863a9efde677b61d174c3de319e8f6dd9644217e6d99f33063749704' 
  AND token = '+z9N/JysYTfqBei3B5GzFTq0SCdsPn3tIrj1oW711bU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00393

JSON explain

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