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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7c66bb5e502977c8c85273d75d5a65bac9b820c53b21b81d409a59462602bd0' 
  AND token = 'ObN+zL96gdTXBsDs2XTvckfvxVaTfPncAnwQwugt5hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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