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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cca13a812e3e8374d0eadd45a1b4fc01a7143895c363f1cbb28524db8e856805' 
  AND token = 'G2EwKhnoW7jyr/hKsBCWK3+M35WSYDwFxbmmB5NX+l0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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