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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd213c746da636b3cfa1c1da882afa8cb3ea9d18cfcf71308275f91ee79049156' 
  AND token = 'ciyN3MX09AczW3fOpaGCtTtsE55Nc85BHyQsYjWsyJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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