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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92fe143ed6f8a2e607758a785d72753d90ebdb54ff60659b7b16611bdf6ba440' 
  AND token = 'Fdz2ZXipqjjCjHcw9D9tElHDfFA4zH0amAkIK7nguls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00097

JSON explain

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