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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fda1115578b6d91ed0aad36e9808c63a5d932eded8726a1aff051ff0b4a13f0' 
  AND token = 'oVsxfEaNCZzBvrQRILDAQ5VF3g6F/MdTpeG1w4Qhc1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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