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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c924c58127d3c7abe59ed4a9555bb8f18c7a4c2cbce2c3ebff11b5aae35d237' 
  AND token = 'bu4af4D5iLEibYntHltjTkKHN+JeulL01oW3ZWD0FwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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