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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c873a27c9755cacf2084f545d88bbdf34445a26064af49524991195de0db4b3' 
  AND token = 'Z75pQ7VR5q6IsME1a8C/YEMtv0GLVf/0cjfwO+tkIac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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