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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2b4aee5b72d6db7084912bd3349cb3d7c38008c1a80c9adf2f7fb6ea40e1a41' 
  AND token = 'ALNxob2RBZVlyc+YfZwnyLNcSL0hb/Z5IaXSu0hon2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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