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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adab81800a95a15cf4cd60f0cb34c4ada4135c8f8872163390e11e53f6d8b139' 
  AND token = '7EGPUP0qh+LdRTpUUABfMEZbvF/PG6x9npe4FGBW8ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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