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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ce4686e710b38d20cfd09a3debf0d39fc54efc2008528538c965e2c0016bde9' 
  AND token = '2TmKYY7LN6daogM2JISMfyY0HUuBrl7VOyP+H+uOtJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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