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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1af07d55196c71686696c01c9c77285a0996c5e38116db7d7b340f2e64ca9403' 
  AND token = 'FmT+n1zrWJU+c4jr9wkYA14CZWAbluVHAoXh1v6/ZT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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