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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '465c3f615d9445dd98ac7eca6b8aa80b66b6af7f1070b5d577cb9634b4ddc68d' 
  AND token = '0UrXDisJnONk6DgicKCLhLmZCptsfJdpPRkTknh8i40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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