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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bc0b2e181952a6999448c4b8f40f13b221d32cbb5fee3228266861eeb87e693' 
  AND token = '5j+BqvzXWP/D6U5Bn0LbNTM1+dugOZTheXbNk0SCZ4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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