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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '056d3cb2c1793354ab4c71a6be0b86ebed61fd461fdddd3b28905f02a5e596f4' 
  AND token = 'NQOEuh9/f8f/7GbLep3DRYhWAiLnVcUExOU81HJ9msI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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