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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c17ea2856d4f0b7885f399e134d25d8bba15bbf9befee3bdad575d49d085c947' 
  AND token = 'Rzqi9jhOlFFSA3KQsbc1CJm2kAa7j+mL1ZRFT7GN8wI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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