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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '009d09008a23120fc3a55f0e971ea264f0b40dcbfa8f692e774cf97e9b504486' 
  AND token = 'OYJAZldh9uW9GopfJG2DlxbEjL7tTmROasMh2/dQejI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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