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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea43e26642c97addc4238f9a90066f336c9662a44d58909d5b979aa6834efead' 
  AND token = 'Tgh38/Ic9oTYuz7bjt2MO0QApvHj5ihZVHBt0HDHzAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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