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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '814419fe9f6ee7e205a0971480921cbec8c06512ab208f81290e888ec01e4104' 
  AND token = 'V3plHg9KG54hZuQUaC8rGxZzVut2oFqAgYe8ZPsGIwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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