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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e143a3e019047d298efbb282e5a856b6e8f2e4d2528f4fef39166ebddb162a5' 
  AND token = 'Axv9R4aOZY78tyzfCoXr1DJegZhxr40xM0WUOQXPP/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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