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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2dd5233d331bf9e1a7ce578b7ce93d1edfaf08bb33ae4cb701d6a1deb619227' 
  AND token = 'vccl9t9RcFhZqpcG8W4p+Lw75zNAQKnhJWxl4e7M51E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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