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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b46fdf90098e2e38212039ae9adfe95e18b24e89908065c7f284ce0b404af344' 
  AND token = '+RiIvkIqA98AfluD4DDITn31fu/27MmaP5lBKNQbHpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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