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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04331c200df2ff76d2eae06a7b368584bb2b7239823cda95368b7c05c38ce309' 
  AND token = 'zDUJIyzaABm2vdvC8VSKGOuymjr1DfYD9xJi5IDnke8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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