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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27ab96edb07687d9d207d7ca2a67fad012c5d7a18f13d8bc9b9457b3a86173fb' 
  AND token = 'gTZRVWHGJkVHer+rD9mHovO5ikh0pyAA/dyqtYHWhk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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