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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '619c628d85f4ee8edae060e8a303af2363984a89c08d0afed213dc6e34e9f9fb' 
  AND token = 'VJW3UZhR1AeEcMgoJjFlhC12cWL4JjlqygUUlCiBMGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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