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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3e7867657ce5979172df74bb32817aa081c6eb5e863469187a3f01c1e2731a6' 
  AND token = 'ycY2lX6T1cS2yBdQNt1HoNyGvfKDoTQNQa8ib/sZ+WY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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