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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64604c0635cf6a843b66c3316618ad8d4627ef7b92a6c2ff54fc89fa644a231c' 
  AND token = 'f1lTUJXUS85EBwr+9zbk18uhb1cKsDZbTWzdmjFqqK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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