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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db17c081a085a262cfbb0f90c40ccfbc1e4c63e56db6f97f752ace281e8ec59b' 
  AND token = '21Fhit9Knenzv3PtFZ7onVSNUFr5uvBQ3zC2UPYSq7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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