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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38613d8b2d61a6eacaa50d8740cf2409794322eb776793897f9a884d838a8857' 
  AND token = 'X+6TJstM2l0D/WcN+l37lei84O7+zW7yCLUEBkoup7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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