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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '232e8e3b4c1d9dbe8973f0a5fb31d774aedc2533a9426cd9475cd84717fa23ea' 
  AND token = 'Sohpysi9RpT1oIhVmZRtlvI1H9eQ1Fb9BOpiOHLtigI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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