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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c67c493f9e58838daa1040ba90864b3a20adfe9979e655172a98d56e6dc694f5' 
  AND token = 'Cz+lvmHkUaL7txKdcsz3SgeTR/fvh/i4tl7Sq3pbkY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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