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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d6d3d6b386f3e7dcee39cad05d8e44fc85d60bec6630adbf55be469508e4195' 
  AND token = 'Etcvj4Dfb0ksxLV4v6WYpTftKc/NrCaa1wtTTJYpzI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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