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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc9f780e4655d586a974370067880d2db1273a4fe72cd6e9e65ef56cbf89341c' 
  AND token = 'BZDE+AjalOJf0cNn52j2ebauqG5sX9UwAcVhaQuVYus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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