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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4df0f13e8a261aae03abcf11321bb756f19ec60e03793bb16656a19f5008ed0c' 
  AND token = 'h3yKa5Mn+RNundI2hOIuIhqMYijX356TMSaldLlIhFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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