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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e217a8913528a9c9585121d3ba833b3515aa059ccd3160b1c982dd9232341819' 
  AND token = 'rkQIlOKf8g9MOtNciyuAmYTLcdT08plz3OVRWAB9sAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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