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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd046c9015bf92dc1d2e3db6b2b7707e3e03d7bb0c4a7ba5ee57a8ff23776cd11' 
  AND token = 'i8v0UQNvMV1OtXqQeXTie6MeAvDSbYa2mmm95HfZmjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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