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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2260e8cb31cab9e204e3a2bc5b074eecb85f98f3fee7fc45ee2699287996d77' 
  AND token = 'hB9jIy5pf7h83ImkNjezgW0+8EwSUg/McLuu30ri6W8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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