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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72e97674eac420b601665dae3adb950b01bf18ae3b8774f1a9a5e028d93deff3' 
  AND token = '5VrR/pltISoIIuQIsxmya/5h/G/bJfWhwhdxsuiyviY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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