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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f687cc91d0ccab5d67c3129234d5627f2d41ea2cce50159539cb5df7ce5b5433' 
  AND token = 'XaC/OG4eAtneftJMbfMFGxw32wNerTee7m9pEU0Lmh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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