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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '760641e1b99705a80de7376dac8e03eff70a72c2f55432a193c9b45034f67823' 
  AND token = 'ALssQ6sXLXM3NPpM+h/IxtMvfu/gM8nOO27nc1Aecys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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