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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19b4c691e3eb386155cd6fab068f10856386c7236063090c0d20fb01b0a1f0f7' 
  AND token = 'GXEen7TWmRdNN0eRMPwk4YLsYbCa0kjj+rcApzpEP3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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