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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4823c95c4e9464693110148b989562463a20fdd438abaa870822a3c1c9ae3712' 
  AND token = 'Vsfh6Rl4txxM09ZaOXNiX2SrwjSvK5ppW9WN0XCcq/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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