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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd19276e263f59f5e768ebf225363ff07a696f35c2393d469b89931de350bac2' 
  AND token = '4lPERKbLM+Ic/I8SnaSTPMYic6fLpCxvQmRS9UKIqCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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