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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4087f0fdafc4066071af67415ff8cd8854f835ea8f58494f2e358ee83bde7f6' 
  AND token = 'QOhONFbgFZYI4rYH1Ou1BskJY1Mzu1++Q9BC04IE/iA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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