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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c2b03c15afdf66f983c9bffd4f16128b4c945b9e6b9164aeb0864ef5c105fe6' 
  AND token = '5bqyTwnoNmDLLeI1RXAbdvG2Ab/7HV2vRQSLOaSsPuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00384

JSON explain

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