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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96bacfa196f8c8de5fb74e82f3c8bd4c2241d66d7fc1faea8b170768ec6c2838' 
  AND token = 'Rw3W2qSk4baen1Vw9xn58r8QoQjIaUuAN82ggr0GoVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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