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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec5011d55cfb4d32db43e7fafa2dd551c506e3502cdafeb9cb6dd85a1dae1d79' 
  AND token = 'BPs6msP+d14hAmfaRgyYIoCrThTFg5mOuBm+G13PuOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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