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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdeb732865b80eb62be2a7be2781b263c50438b0b5aa38be72966b5a83618bbe' 
  AND token = 'j2p7ulIvyjRxC1eNK4tDQcGxiAndgI8UkthN1Nhu79c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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