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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92edccd51dd2cc133ec5ddb91f2ded36619782ab02f7cb06410edd26301faf47' 
  AND token = '+6Cocqyt/dFy6/s4i+4OVC/NgMnAsdaiUlS439iYgy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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