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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0acd07f69b9d01203c48e9e5715fc5a509d3988622044d6971199766889bde17' 
  AND token = '5+ZIKQlUvY7FLP5lcorcK/Y5dyvd2C95/Tr0CNk5fqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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