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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90f6d56623219791963f12417ac218689e30efe323ad5c4ec9c0f9943fdcf06d' 
  AND token = '8KS3uW7nj5BYjOO+8UGgxM0MgPyfzLQx69UW+VtQFt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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