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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b897796db099b8c0b6710830533fad737797773d6365da777cfc7a15ffe188b' 
  AND token = 'xFE8d96S2y6c//r+A+djEHD5HEubijEMCETPbEGfylw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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