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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac9ad95e60289827f280a38abce934638d157b460370c5c91913028e43e262ae' 
  AND token = 'uQPpwgR8HDPA21/Jv2rkD09u2nWhvmHsBU3We9Mkm+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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