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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4a8390fc9c03125089e74e3adad647f90985a0e2f5169ffe0648fbac4261ccc' 
  AND token = '6EFbH01mr8QcB3VcPcOwFooGRsnc4cT2bhX7tsFPKK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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