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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '972aa33849704222f4adccf55ef8abb121fae58ace36ca4a13ebba2be4c26ba9' 
  AND token = 'Ix+s7llwsPs6JoX2SABCylb7Iuf/ZFWc9SxMFSwTV4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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