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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '531089e8900f2ffae3172de86b130d2e24c899281270e27b64b96b64e82bc376' 
  AND token = 'yszIrnK2dMcUxjgDfo3fSdRLxTHcj3+rMfXjX19ZO00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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