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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8d70d965a029643bde5747bec4a39a28e6133afdd24787ff4d9dd5d7ebf0071' 
  AND token = 'HihWjQjz22UPrAgwISrWFPTVe6bSmML9oBi6rVGNjdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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