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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29b0bbc7ab6d10b17e7c5b80823bbfbe7eea7372f92b245f43677ed47840f51b' 
  AND token = 'tnQdscceX8oCICeU9Inxhyx67FIHFfzhemKC7xdpE6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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