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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '536321ff41aa7c02053866f6737d90c7e1ca86787d6c68d4c476553636eb15ae' 
  AND token = 'S+CGMuntcRiUbKQzYibFKzdU+V9kxtYeAVGlyS+fmpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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