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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03ebc708341a89488f776fed6e714866ebc6b5c8f92bdea9ae21d1eed01b4b7a' 
  AND token = 'nfPKU6fef/ZXGrfMuV4uLW3ANIET22USV63Kn+XQceg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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