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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84ce61c5a7b0e2e290f6b54119974fe826db6b4b1ddc39ec8348b1ced5ac776d' 
  AND token = '8P66+XyqiHq2d6E/L6ZgLPUkOB+7WyJfRYCLdRAYaTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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